Redirect both cout and stdout to a string in C++ for Unit Testing

Question

I\'m working on getting some legacy code under unit tests and sometimes the only way to sense an existing program behavior is from the console output.

I see lots of

Answer 1

This may be an alternative:

char bigOutBuf[8192];
char savBuf[8192];

fflush(stdout);
setvbuf(stdout,bigOutBuf,IOFBF,8192);//stdout uses your buffer

//after each operation
strncpy(savBuf,bigOutBuf,8192);//won't flush until full or fflush called

//...

//at long last finished
setbuf(stdout,NULL);//reset to unnamed buffer

This just intercepts the buffered output, so still goes to console or wherever.

Hope this helps.